Merge branch 'fix_database_error_reporting' into 'development'

Fix error handling in the database query module

Changes in this merge request
* Add proper error handling in libs/db/query_exec. Uses a catch function after each then to proper capture database errors and report them to the user.
* Add logging the error stack when a database query error occurs.
* Change error message reported in the response when a database query occurs, because the user making the request does not need to know about an internal database error.

See merge request !28